Advertisement
M
E F
w
H o
d F
b l e
e m
a s s
R e
The EFM standard supports on-the-fly adaptation of bond groups, allowing the bonding of pairs with unequal
rates, as well as hitless adds or drops of individual pairs from the group. This resiliency translates into higher value
for EFM services in mission-critical business or public-sector applications where high link reliability and stability is
of utmost importance.
The performance of the EFM standard represents a nearly 10x improvement over legacy T1/E1-based services.
Rates for links without repeaters stay very robust over the typical "in town" distances required to serve SMOs. The
addition of repeaters can carry multi-megabit speeds over copper at the greater distances required for cell site
backhaul.
Theoretical Best-Case EFM Rate vs. Reach
(Zero-Noise Environment)
16,000
TC-PAM-128 Modulation
15,000
14,000
13,000
...-64
12,000
11,000
10,000
... -32
9,000
8,000
...-16
7,000
6,000
5,000
...-8
4,000
3,000
TC-PAM-4
2,000
1,000
0
0
1
0
A C C E S S F O R A C O N V E R G I N G W O R L D
r k s
W o
e
r a m
n x
P a i
L o o
e t
e r n
E t h
e s s
A c c
e
v i c
D e
2
3
1
2
0.4mm / 26AWG Loop Length
m e
F r a
e t
e r n
E t h
m e
e n t
F r a
g m
F r a
A g
E F M
r m
t f o
P l a
d
i s t e
e r
T w
o p p
r C
p s
Up to 4 repeaters can be
used, on 6 kft. spacing
4
5
6
3
e t
e r n
E t h
C
M A
L
D S
S H
n x
Y
P H
s
t ' n
D i s
m
F r o
i o n
g a t
g r e
T1 reference
7
8 km
4
5 mi.
Advertisement
